US5820809A - Manufacturing method for key tops - Google Patents

Manufacturing method for key tops Download PDF

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Publication number
US5820809A
US5820809A US08/739,688 US73968896A US5820809A US 5820809 A US5820809 A US 5820809A US 73968896 A US73968896 A US 73968896A US 5820809 A US5820809 A US 5820809A
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US
United States
Prior art keywords
light
mold
metal mold
manufacturing
key tops
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/739,688
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English (en)
Inventor
Hiroshi Yajima
Masayuki Kashino
Akihiro Tsuji
Masaru Nakajo
Motoshi Yamauchi
Nobuaki Oji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FUJIPOLYMERTECH Co Ltd
Polymatech Co Ltd
Original Assignee
Polymatech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polymatech Co Ltd filed Critical Polymatech Co Ltd
Assigned to FUJIPOLYMERTECH CO., LTD. reassignment FUJIPOLYMERTECH CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KASHINO, MASAYUKI, NAKAJO, MASARU, OJI, NOBUAKI, TSUJI, AKIHIRO, YAJIMA, HIRISHI, YAMAUCHI, MOTOSHI
Assigned to POLYMATECH CO., LTD. reassignment POLYMATECH CO., LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: FUJI POLYMERTECH CO., LTD., FUJI RUBBER CO., LTD.
Application granted granted Critical
Publication of US5820809A publication Critical patent/US5820809A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B29C43/183—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • B29C70/745—Filling cavities in the preformed part
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/002—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3431—Telephones, Earphones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/46—Knobs or handles, push-buttons, grips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/18—Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks
    • H01H2009/187—Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks having symbols engraved or printed by laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/07—Actuators transparent
    • H01H2221/0702—Transparent key containing three dimensional (3D) element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/044—Injection moulding
    • H01H2229/047—Preformed layer in mould

Definitions

  • the present invention relates to a manufacturing method for key tops of switches incorporated in the input section of telephone sets, audio equipment, TV sets, video tape recorders, facsimile terminal equipment, copying machines, and car-mounted equipment.
  • a conventional manufacturing method for key tops comprises the steps of: first, molding a material into the shape of a key top; coating the whole surface of this 3-D shaped material in white; further printing a colored pattern such as designation on the top face; then coating the whole surface in black for shield of light; and forming a desired pattern by laser cut of the top face.
  • the method by putting a readout part in metal mold beforehand needs a clamp for registration of the readout film, having a problem in accuracy, and further might cause a film distortion in the time of molding.
  • the present invention has omitted a laborious coating, improved the accuracy of printing and at the same time reduced the number of steps in manufacture greatly.
  • FIG. 1 illustrates the steps in manufacture.
  • FIG. 2 is a sectional view showing another metal mold.
  • FIG. 3 is a top view showing the plane of FIG. 2.
  • FIG. 4 is a sectional view showing a push jig.
  • FIG. 5 is a sectional view showing the setting of a push jig.
  • FIG. 6 is a sectional view showing the insertion of a cored mold.
  • FIG. 7 illustrates a key top molded using a cored mold.
  • FIG. 8 is a sectional view showing the molding of a key top molded article inserted in a metal mold.
  • the present invention makes a black daubed printing on a peeled sheet 1 such as a fluorine film with light shielding ink 2, e.g., silicon ink, to form a light shielding film, then either effects a white daubed printing according to the need for a high quality design or a desired colored printing 3 as a readout at predetermined positions corresponding to key tops positions and finishes the printing process.
  • a frame 4 is established by gluing it to the circumference.
  • the peeled sheet 1 is peeled off and a light-shield film sheet 5 is laid onto the metal mold, when the light-shield film sheet 5 is tensed with the frame 4.
  • a peeled sheet 1 needs heat resistance and is desired to be of silicone group, fluorine group, imide group, etc. from which a light-shield film is easily peeled off. Stretched and sucked, a light-shield film is desired to be an elastic film usually of silicon group, urethane group, acryl group, epoxy group and other synthetic rubber group, extensible above 300%.
  • the forming methods thereof include printing and coating, but printing is preferable from the standpoint of the control of a light-shielding film and the extent of working space.
  • a reinforcing film may be formed by using light-pervious ink, if necessary, to promote the film strength.
  • this reinforcing film is provided for the purpose of promoting the wear durability of the surface because the wear of the key top corner portion in a practical use might entail a quality deterioration of commodities due to a leak of light from the bottom light source when a key sheet with the key top attached is used as the key switch for a portable phone and such others.
  • the wear durability though dependent on the film thickness of a reinforcing film and the shape of a key top, is promoted about 1.5-2.0 times.
  • a metal mold 6 As a metal mold 6, a generally used evacuation metal mold, if necessary, an evacuation mold of material with minute pores made, is used and the printed sheet 5 is attracted through this metal mold by suction.
  • the silicone sheet 5 formed with silicon ink is extended to each fixed position in the metal mold without compulsion, sucked and preformed because of usually being extensible above 300% as mentioned above.
  • a material 7 such as silicone is put into for molding, then the top face of the key top is processed under laser beams to make out a readout such as letters, patterns 8 or the like.
  • a light-irradiating key top can be manufactured.
  • the metal mold used for evacuation molding includes a mold with numerous fine pores not only on the bottom face but also on the side face of each cavity or a mold of porous material wherein a print sheet 5 placed thereon is sucked in for premolding as shown in FIG. 1.
  • another metal mold includes, not a method to suck the print sheet 5 from the bottom face or the side face of each cavity, but a metal mold 6 wherein a suction path 10 leading to the respective cavities 9 is formed on the surface thereof and is connected to a suction port 11.
  • the interiors of individual cavities 9 takes a negative pressure by the start of suction and a print sheet 5 placed on the top is attracted in conformity to the shape of the metal shape and is premolded.
  • a printed sheet 5 is attracted and retained, by using a suction type push jig 14 with those protrusions 13 of male mold shape which enter such cavities of the mold as shown in FIG. 4, to match this push jig 14 into the metal mold 6.
  • the push jig 14 is detached and an elastic material such as silicone rubber, natural rubber or other synthetic rubbers is inserted to effect a on-piece molding.
  • the display section of characters, symbols or the like is created after the completion of a 3-D molding, but printing of a light-shielding film is finished beforehand except for the display section of characters, symbols or the like in the formation of the light-shielding film on a to-be-peeled sheet with light-shielding ink and all works by a laser processing, related to the display section of characters, symbols or the like, can be performed on the plane sheet, so that the operation can be greatly simplified.
  • a key top molded article 17 comprising a premolded heat-resistant transparent resin, for example, thermoplastic resin such as fluorine group, polysulfone group and polyimide group or thermo-setting resin such as phenol group, melamine group, epoxy group, silicone group and diallyl phthalate group, which is not deteriorated under the influence of the temperature of an inserted metal mold is inserted before the attraction of a printed light-shielding film 5 into the metal mold 6.
  • a similar molding to that of other embodiment enables a key top with a hard top face, an elastic base portion and a covered character face of nonerasable characters to be obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacture Of Switches (AREA)
  • Push-Button Switches (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US08/739,688 1995-11-01 1996-10-29 Manufacturing method for key tops Expired - Lifetime US5820809A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP30640295 1995-11-01
JP7-306402 1995-11-01

Publications (1)

Publication Number Publication Date
US5820809A true US5820809A (en) 1998-10-13

Family

ID=17956591

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/739,688 Expired - Lifetime US5820809A (en) 1995-11-01 1996-10-29 Manufacturing method for key tops

Country Status (5)

Country Link
US (1) US5820809A (es)
EP (1) EP0772213B1 (es)
KR (1) KR100420408B1 (es)
DE (1) DE69606494T2 (es)
TW (1) TW319875B (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5983789A (en) * 1999-01-28 1999-11-16 Monarch Marking Systems, Inc. Printing band and method of making same
US20050217686A1 (en) * 2004-04-06 2005-10-06 Big Plus Cre Inc. Jun-Hee Lee Method for manufacturing artificial nail
US20110018161A1 (en) * 2009-07-23 2011-01-27 Chung-Hsin Yang Method of fabricating keycaps
US20160096317A1 (en) * 2014-10-03 2016-04-07 Taiwan Green Point Enterprises Co., Ltd. Method of making a molded article and molded article

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
SE514041C2 (sv) * 1997-06-17 2000-12-18 Silitek Corp Förfarande för framställning av en knappsats av hårdgummi
JP3102854B2 (ja) * 1997-08-08 2000-10-23 信越ポリマー株式会社 照光式押釦スイッチ用カバー部材およびその製造方法
ATE220001T1 (de) * 1998-06-17 2002-07-15 Kundisch Gmbh & Co Kg Tiefziehwerkzeug für kunststoffplatten oder - folien und verfahren zu deren herstellung
US6861961B2 (en) * 2000-03-30 2005-03-01 Electrotextiles Company Limited Foldable alpha numeric keyboard
KR100377638B1 (ko) * 2001-05-18 2003-03-26 주식회사 유일전자 플라스틱 키를 갖는 휴대폰용 키패드 제조방법
KR100997396B1 (ko) 2008-05-06 2010-11-30 (주)케이티씨 인쇄시트의 제조방법 및 그를 이용한 키탑패드의 제조방법
EP2269795B1 (de) * 2009-06-09 2013-07-31 Abatek International AG Verfahren zur Herstellung einer Folientastatur und Folientastatur
CN102751122A (zh) * 2011-04-18 2012-10-24 苏州达方电子有限公司 键盘及键帽的制造方法
KR101057079B1 (ko) 2011-06-15 2011-08-16 이성 옵티컬 트랙패드 하우징의 제조 방법
CN103029239B (zh) * 2011-10-10 2014-11-05 靖江市永盛光电科技有限公司 一种导电胶按键硫化加工方法
JP2013157408A (ja) * 2012-01-27 2013-08-15 Nitto Denko Corp 発光ダイオード装置およびその製造方法
CN104384708A (zh) * 2014-10-08 2015-03-04 中国电子科技集团公司第五十五研究所 芯片封装外壳的激光加工方法
CN106128829A (zh) * 2016-08-11 2016-11-16 苏州达方电子有限公司 键盘及键盘制造方法

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US4369157A (en) * 1977-04-11 1983-01-18 Dri-Print Foils, Inc. Method of automatically decorating articles as they are in-mold formed automatically
JPS58132529A (ja) * 1982-02-02 1983-08-06 Matsushita Electric Ind Co Ltd 射出同時成形工法
US4500218A (en) * 1981-06-05 1985-02-19 Toho-Polymer Kabushika Kaisha Keyboard key with embedded top character
US4657419A (en) * 1984-11-02 1987-04-14 Toho Polymer Kabushiki Kaisha Information carrier, having a roughened surface, method of manufacturing same, and apparatus therefor
US4710330A (en) * 1985-01-26 1987-12-01 Olympia Aktiengesellschaft Application of the laser jet method for inscribing office machine keyboard buttons
JPH0692090A (ja) * 1992-09-16 1994-04-05 Key Tranding Co Ltd 凹凸模様付フィルムおよびその製法
US5514319A (en) * 1994-07-27 1996-05-07 Young; Wen-Kuei Method of fabricating a rubber keypad
US5573107A (en) * 1994-08-10 1996-11-12 Shin-Etsu Polymer Co., Ltd. Internally-illuminable push-button switch unit
US5589121A (en) * 1994-07-12 1996-12-31 Teikoku Tsushin Kogyo Co., Ltd. Method of enlarging design provided on a synthetic resin film
US5655826A (en) * 1995-03-29 1997-08-12 Shin-Etsu Polymer Co., Ltd. Illuminable push button switching unit

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US3592979A (en) * 1969-11-05 1971-07-13 Ncr Co Elastomeric keyboard with improved printed circuit contact means
DE4107841A1 (de) * 1991-03-12 1992-09-17 Aeg Mobile Communication Tastenanordnung
JP2657160B2 (ja) * 1992-02-14 1997-09-24 信越ポリマー株式会社 照光式押釦スイッチ用カバー部材の製造方法
CA2101300C (en) * 1992-08-04 1998-07-28 Emery I. Valyi Process and apparatus for forming a color coated article
US5376314A (en) * 1993-04-29 1994-12-27 Illinois Tool Works Inc. Method of making a laser ablated formed cap
US5399821A (en) * 1993-10-20 1995-03-21 Teikoku Tsushin Kogyo Co., Ltd. Keytop for push-button switches, and method of manufacturing same

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369157A (en) * 1977-04-11 1983-01-18 Dri-Print Foils, Inc. Method of automatically decorating articles as they are in-mold formed automatically
US4500218A (en) * 1981-06-05 1985-02-19 Toho-Polymer Kabushika Kaisha Keyboard key with embedded top character
JPS58132529A (ja) * 1982-02-02 1983-08-06 Matsushita Electric Ind Co Ltd 射出同時成形工法
US4657419A (en) * 1984-11-02 1987-04-14 Toho Polymer Kabushiki Kaisha Information carrier, having a roughened surface, method of manufacturing same, and apparatus therefor
US4710330A (en) * 1985-01-26 1987-12-01 Olympia Aktiengesellschaft Application of the laser jet method for inscribing office machine keyboard buttons
JPH0692090A (ja) * 1992-09-16 1994-04-05 Key Tranding Co Ltd 凹凸模様付フィルムおよびその製法
US5589121A (en) * 1994-07-12 1996-12-31 Teikoku Tsushin Kogyo Co., Ltd. Method of enlarging design provided on a synthetic resin film
US5514319A (en) * 1994-07-27 1996-05-07 Young; Wen-Kuei Method of fabricating a rubber keypad
US5573107A (en) * 1994-08-10 1996-11-12 Shin-Etsu Polymer Co., Ltd. Internally-illuminable push-button switch unit
US5655826A (en) * 1995-03-29 1997-08-12 Shin-Etsu Polymer Co., Ltd. Illuminable push button switching unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5983789A (en) * 1999-01-28 1999-11-16 Monarch Marking Systems, Inc. Printing band and method of making same
US20050217686A1 (en) * 2004-04-06 2005-10-06 Big Plus Cre Inc. Jun-Hee Lee Method for manufacturing artificial nail
US20110018161A1 (en) * 2009-07-23 2011-01-27 Chung-Hsin Yang Method of fabricating keycaps
US20160096317A1 (en) * 2014-10-03 2016-04-07 Taiwan Green Point Enterprises Co., Ltd. Method of making a molded article and molded article

Also Published As

Publication number Publication date
KR100420408B1 (ko) 2004-05-06
DE69606494D1 (de) 2000-03-09
KR970029939A (ko) 1997-06-26
EP0772213B1 (en) 2000-02-02
TW319875B (es) 1997-11-11
DE69606494T2 (de) 2000-10-19
EP0772213A1 (en) 1997-05-07

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